UnitedHealth Group — Just three weeks after downgrading the stock to "neutral," Mizuho upgraded the health insurer back to a "buy" rating following its meeting Tuesday with analysts and investors. Mizuho said it is now convinced that the company is well-insulated from any downside due to political change.

Splunk — The big data software maker reported adjusted quarterly profit of 12 cents per share, four cents a share above estimates. Revenue came in above forecasts, as well. Its current-quarter revenue guidance is also slightly above Street consensus, and the company boosted its outlook for the full year.

Nutanix — Nutanix lost 37 cents per share for its latest quarter, seven cents a share less than expected. The cloud data storage company's revenue was above estimates. The company also gave upbeat guidance for the current quarter.

Royal Bank of Scotland — RBS failed a Bank of England stress test, and said it would cut costs and sell assets to boost its capital levels as a result.

Philip Morris International — The tobacco producer may eventually stop selling cigarettes, according to Chief Executive Officer André Calantzopoulos. He told the BBC that alternative products, such as its IQOS smokeless cigarette, could eventually replace traditional cigarettes.

United Technologies – United Technologies reached a deal with President-elect Donald Trump and Vice President-elect Mike Pence to keep about 1,000 jobs at UTC's Carrier air conditioner plant in Indianapolis.

Kroger — Kroger and other publicly traded supermarket operators will be on watch today, following a report from Reuters that privately held Albertsons is in advanced talks to acquire another privately held grocery store operator, Price Chopper, for about $1 billion.

Pilgrim's Pride — Pilgrim's Pride is buying smaller chicken producer GNP Co. from its current owner, meatpacking company JBS, in a $350 million cash deal.

Facebook — Facebook is launching "Instant Games," which lets users play games for free on mobile devices as well as on its website.

CBS — CBS is holding out for more money to provide content to streaming services, according to the New York Post. The paper said that CBS CEO Les Moonves thinks streaming services need CBS more than CBS needs them.